题目内容
7．He does his homework every evening．（改为否定句）Hedoesn't do his homework every evening．
分析 他每晚都做作业．
他每晚都不做作业．
解答 答案：doesn't do．原句中的does是do的三单形式，主语he，故借助于does构成否定，后加原形do，故答案是doesn't do．
点评 含有be动词，情态动词或者助动词have/has的句子转化成否定时在其后面加上not，一般实意动词的否定式，通常应根据不同时态和人称在实意动词之前加don't，doesn't，didn't等．
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